/* ═══════════════════ 基础与主题变量 ═══════════════════ */
:root {
  --primary: #4f46e5;
  --primary-600: #4338ca;
  --primary-soft: #eef2ff;      /* 选中底色 */
  --primary-mist: #f5f7ff;      /* 悬停底色 */
  --primary-faint: #fafbfe;     /* 常规浅底 */
  --primary-line: #c7d2fe;      /* 悬停描边 */
  --primary-hover: #a5b4fc;     /* 选项悬停描边 */
  --primary-ring: rgba(79, 70, 229, .12);
  --grad-a: #6366f1;            /* 品牌渐变起 */
  --grad-b: #8b5cf6;            /* 品牌渐变止 */
  --brand-shadow: 0 6px 16px rgba(99, 102, 241, .35);
  --bg: #eef2f7;
  --bg-grad-top: #e8edf5;
  --card: #ffffff;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
  --soft-bg: #f8fafc;
  --softer-bg: #f1f5f9;
  --track: #eef2f7;
  --text-soft: #475569;
  --success: #16a34a;
  --success-soft: #f0fdf4;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --warn: #d97706;
  --warn-soft: #fffbeb;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(15, 23, 42, .06), 0 8px 24px rgba(15, 23, 42, .06);
}

/* ── 主题：海蓝 ── */
html[data-theme="blue"] {
  --primary: #2563eb; --primary-600: #1d4ed8; --primary-soft: #eff6ff;
  --primary-mist: #f0f7ff; --primary-faint: #fafcff; --primary-line: #bfdbfe;
  --primary-hover: #93c5fd; --primary-ring: rgba(37, 99, 235, .12);
  --grad-a: #3b82f6; --grad-b: #06b6d4; --brand-shadow: 0 6px 16px rgba(37, 99, 235, .35);
  --bg-grad-top: #e3edf7;
}

/* ── 主题：翡翠 ── */
html[data-theme="green"] {
  --primary: #059669; --primary-600: #047857; --primary-soft: #ecfdf5;
  --primary-mist: #f0fdf9; --primary-faint: #fafefc; --primary-line: #a7f3d0;
  --primary-hover: #6ee7b7; --primary-ring: rgba(5, 150, 105, .12);
  --grad-a: #10b981; --grad-b: #14b8a6; --brand-shadow: 0 6px 16px rgba(5, 150, 105, .35);
  --bg-grad-top: #e5f2ec;
}

/* ── 主题：暖橙 ── */
html[data-theme="orange"] {
  --primary: #ea580c; --primary-600: #c2410c; --primary-soft: #fff7ed;
  --primary-mist: #fffaf5; --primary-faint: #fffcf9; --primary-line: #fed7aa;
  --primary-hover: #fdba74; --primary-ring: rgba(234, 88, 12, .12);
  --grad-a: #f97316; --grad-b: #f59e0b; --brand-shadow: 0 6px 16px rgba(234, 88, 12, .35);
  --bg-grad-top: #f6ede4;
}

/* ── 主题：玫粉 ── */
html[data-theme="rose"] {
  --primary: #e11d48; --primary-600: #be123c; --primary-soft: #fff1f2;
  --primary-mist: #fff5f6; --primary-faint: #fffcfd; --primary-line: #fecdd3;
  --primary-hover: #fda4af; --primary-ring: rgba(225, 29, 72, .12);
  --grad-a: #f43f5e; --grad-b: #d946ef; --brand-shadow: 0 6px 16px rgba(225, 29, 72, .35);
  --bg-grad-top: #f5e6ec;
}

/* ── 主题：暗夜 ── */
html[data-theme="dark"] {
  --primary: #818cf8; --primary-600: #6d7df0; --primary-soft: rgba(129, 140, 248, .16);
  --primary-mist: #1b2544; --primary-faint: #18223a; --primary-line: #4654a3;
  --primary-hover: #5b6cbf; --primary-ring: rgba(129, 140, 248, .25);
  --grad-a: #6366f1; --grad-b: #8b5cf6; --brand-shadow: 0 6px 16px rgba(99, 102, 241, .4);
  --bg: #0b1220; --bg-grad-top: #0e1729;
  --card: #151f33; --text: #e2e8f0; --muted: #94a3b8; --border: #2b3a55;
  --soft-bg: #1a2740; --softer-bg: #16223a; --track: #223050; --text-soft: #b3c0d8;
  --success: #4ade80; --success-soft: #0d2b1c;
  --danger: #f87171; --danger-soft: #3a1418;
  --warn: #fbbf24; --warn-soft: #332208;
  --shadow: 0 1px 3px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .35);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: linear-gradient(180deg, var(--bg-grad-top) 0%, var(--bg) 240px);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.65;
  transition: background .25s ease, color .25s ease;
}

.hidden { display: none !important; }
.muted { color: var(--muted); font-weight: 400; font-size: .85em; }

/* ═══════════════════ 头部 ═══════════════════ */
.top-header {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  max-width: 1160px; margin: 0 auto; padding: 22px 20px 6px;
}
.brand { display: flex; align-items: center; gap: 14px; }
.brand-icon {
  width: 46px; height: 46px; border-radius: 12px;
  background: linear-gradient(135deg, var(--grad-a), var(--grad-b));
  color: #fff; font-size: 20px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--brand-shadow);
}
.brand-text h1 { font-size: 19px; font-weight: 700; letter-spacing: .5px; }
.brand-text p { font-size: 12.5px; color: var(--muted); }
.header-right { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; justify-content: flex-end; }
.bank-status { font-size: 12.5px; color: var(--muted); background: var(--card); border: 1px solid var(--border); padding: 6px 12px; border-radius: 999px; }

/* 主导航 */
.main-nav { display: flex; gap: 4px; background: var(--card); border: 1px solid var(--border); padding: 4px; border-radius: 999px; }
.nav-btn { border: none; background: transparent; padding: 6px 16px; border-radius: 999px; font-size: 13.5px; font-weight: 600; color: var(--muted); cursor: pointer; font-family: inherit; transition: all .13s ease; }
.nav-btn:hover { background: var(--primary-mist); color: var(--text); }
.nav-btn.active { background: var(--primary); color: #fff; }
.nav-badge { display: inline-block; min-width: 16px; margin-left: 5px; padding: 0 5px; border-radius: 999px; background: var(--danger); color: #fff; font-size: 10.5px; line-height: 15px; text-align: center; vertical-align: 1px; }

/* 主题选择器 */
.theme-picker { display: flex; gap: 7px; align-items: center; background: var(--card); border: 1px solid var(--border); padding: 7px 10px; border-radius: 999px; }
.theme-dot {
  width: 17px; height: 17px; border-radius: 50%; border: 2px solid var(--border);
  cursor: pointer; padding: 0; transition: transform .12s ease, border-color .12s ease;
}
.theme-dot:hover { transform: scale(1.2); }
.theme-dot.active { border-color: var(--text); transform: scale(1.12); }

/* ═══════════════════ 布局 ═══════════════════ */
.container { max-width: 1160px; margin: 0 auto; padding: 16px 20px 60px; }
.view { animation: fadein .25s ease; }
@keyframes fadein { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.card {
  background: var(--card); border-radius: var(--radius);
  box-shadow: var(--shadow); border: 1px solid var(--border);
  padding: 24px;
}
.card-title { font-size: 16px; font-weight: 700; margin-bottom: 16px; }

/* ═══════════════════ 按钮 / 表单 ═══════════════════ */
.btn {
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  padding: 9px 18px; border-radius: 10px; font-size: 14.5px; font-weight: 600;
  cursor: pointer; transition: all .15s ease; font-family: inherit;
}
.btn:hover { border-color: var(--primary-line); background: var(--soft-bg); }
.btn:active { transform: scale(.97); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-600); border-color: var(--primary-600); }
.btn.danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn.danger:hover { background: #b91c1c; }
.btn.ghost { background: transparent; }
.btn.btn-lg { width: 100%; padding: 13px; font-size: 16px; border-radius: 12px; }
/* 标记按钮选中态：需覆盖 .btn.ghost 的透明背景，避免浅色主题下不可见 */
#btn-flag.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
#btn-flag.primary:hover { background: var(--primary-600); border-color: var(--primary-600); }

.field { margin-bottom: 18px; }
.field-label { display: block; font-size: 13.5px; font-weight: 600; color: var(--muted); margin-bottom: 8px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
select {
  width: 100%; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--border);
  font-size: 14.5px; background: var(--card); color: var(--text); font-family: inherit; cursor: pointer;
}
select:focus, .btn:focus-visible { outline: 2px solid var(--primary-line); }

/* 自定义题量 */
.count-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.count-chips { display: flex; gap: 8px; flex-wrap: wrap; }
.count-chip {
  border: 1.5px solid var(--border); background: var(--primary-faint); color: var(--muted);
  border-radius: 999px; padding: 6px 14px; font-size: 13px; font-weight: 600;
  cursor: pointer; font-family: inherit; transition: all .13s ease;
}
.count-chip:hover { border-color: var(--primary-hover); color: var(--text); }
.count-chip.active { border-color: var(--primary); background: var(--primary-soft); color: var(--primary); }
.count-input {
  width: 96px; padding: 9px 12px; border-radius: 10px; border: 1.5px solid var(--border);
  font-size: 14.5px; background: var(--card); color: var(--text); font-family: inherit;
  font-variant-numeric: tabular-nums;
}
.count-input:focus { outline: 2px solid var(--primary-line); border-color: var(--primary-line); }

/* 设置页 */
.setup-card { max-width: 720px; margin: 20px auto 0; }
.dir-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.dir-option {
  border: 2px solid var(--border); border-radius: 12px; background: var(--primary-faint);
  padding: 16px 12px; text-align: center; cursor: pointer; transition: all .15s ease;
  display: flex; flex-direction: column; gap: 4px; font-family: inherit;
}
.dir-option:hover { border-color: var(--primary-line); }
.dir-option.selected { border-color: var(--primary); background: var(--primary-soft); box-shadow: 0 0 0 3px var(--primary-ring); }
.dir-icon { font-size: 22px; }
.dir-title { font-size: 14px; font-weight: 700; }
.dir-desc { font-size: 12px; color: var(--muted); }

/* 练习模式选择 */
.mode-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.mode-option {
  border: 2px solid var(--border); border-radius: 12px; background: var(--primary-faint);
  padding: 14px 12px; text-align: left; cursor: pointer; transition: all .15s ease;
  display: flex; flex-direction: column; gap: 3px; font-family: inherit;
}
.mode-option:hover { border-color: var(--primary-line); }
.mode-option.selected { border-color: var(--primary); background: var(--primary-soft); box-shadow: 0 0 0 3px var(--primary-ring); }
.mode-icon { font-size: 18px; margin-bottom: 4px; }
.mode-title { font-size: 14px; font-weight: 700; }
.mode-desc { font-size: 12px; color: var(--muted); }
.tip { font-size: 12.5px; color: var(--muted); margin-top: 12px; text-align: center; }

/* ═══════════════════ 考试页 ═══════════════════ */
.exam-topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 18px;
  padding: 14px 20px; margin-bottom: 16px; position: sticky; top: 10px; z-index: 50;
}
.progress-wrap { flex: 1; min-width: 0; }
.progress-text { font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.progress-text b { color: var(--primary); }
.progress-bar { height: 8px; background: var(--track); border-radius: 999px; overflow: hidden; }
.progress-fill { height: 100%; width: 0; background: linear-gradient(90deg, var(--grad-a), var(--grad-b)); border-radius: 999px; transition: width .25s ease; }
.topbar-right { display: flex; align-items: center; gap: 12px; }
.timer {
  font-variant-numeric: tabular-nums; font-size: 17px; font-weight: 700;
  background: var(--soft-bg); border: 1px solid var(--border); padding: 7px 14px; border-radius: 10px;
}
.timer.warn { color: var(--danger); border-color: #fecaca; background: var(--danger-soft); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .6; } }

.exam-layout { display: grid; grid-template-columns: 1fr 264px; gap: 16px; align-items: start; }

.question-panel { padding: 26px 28px; }
.q-meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.q-no { font-size: 15px; font-weight: 700; color: var(--primary); }
.badge { font-size: 12px; font-weight: 600; padding: 3px 10px; border-radius: 999px; }
.badge-single { background: #eff6ff; color: #2563eb; }
.badge-multi { background: #f5f3ff; color: #7c3aed; }
.badge-judge { background: #f0fdfa; color: #0d9488; }
.badge-cat { background: var(--soft-bg); color: var(--muted); border: 1px solid var(--border); }
.badge-topic { background: var(--warn-soft); color: var(--warn); }
.badge-todo { background: var(--danger-soft); color: var(--danger); }
.badge-mastered { background: var(--success-soft); color: var(--success); }
.badge-flag { background: var(--warn-soft); color: var(--warn); }

.q-question { font-size: 15.5px; margin-bottom: 20px; white-space: pre-wrap; word-break: break-word; }
.q-question code, .ai-report code {
  background: var(--softer-bg); border: 1px solid var(--border); border-radius: 6px;
  padding: 1px 6px; font-size: .92em; font-family: "SF Mono", Menlo, Consolas, monospace;
}
.q-question pre, .ai-report pre {
  background: #0f172a; color: #e2e8f0; border-radius: 10px; padding: 14px 16px;
  overflow-x: auto; margin: 10px 0; font-size: 13px; line-height: 1.6;
  font-family: "SF Mono", Menlo, Consolas, monospace; white-space: pre;
}

.q-options { display: flex; flex-direction: column; gap: 10px; }
.option {
  display: flex; align-items: flex-start; gap: 12px; text-align: left;
  border: 1.5px solid var(--border); border-radius: 11px; background: var(--primary-faint);
  padding: 12px 14px; cursor: pointer; transition: all .13s ease; font-family: inherit; font-size: 14.5px;
}
.option:hover { border-color: var(--primary-hover); background: var(--primary-mist); }
.option .opt-letter {
  flex: none; width: 26px; height: 26px; border-radius: 8px; margin-top: 1px;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700; background: var(--track); color: var(--muted);
  transition: all .13s ease;
}
.option.selected { border-color: var(--primary); background: var(--primary-soft); }
.option.selected .opt-letter { background: var(--primary); color: #fff; }
.q-hint { font-size: 12.5px; color: var(--muted); margin-top: 14px; }

.q-nav { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--border); }

/* 答题卡 */
.grid-panel { position: sticky; top: 86px; padding: 18px; }
.grid-head { font-size: 14px; font-weight: 700; margin-bottom: 12px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(38px, 1fr)); gap: 6px; }
.grid-btn {
  height: 34px; border-radius: 8px; border: 1px solid var(--border); background: var(--card);
  font-size: 12.5px; font-weight: 600; color: var(--muted); cursor: pointer; font-family: inherit;
  transition: all .12s ease;
}
.grid-btn.answered { background: var(--primary-soft); border-color: var(--primary-line); color: var(--primary); }
.grid-btn.flag { border-color: var(--warn); background: var(--warn-soft); color: var(--warn); }
.grid-btn.cur { outline: 2.5px solid var(--primary); outline-offset: 1px; font-weight: 800; }
.grid-legend { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; font-size: 11.5px; color: var(--muted); }
.lg { display: inline-block; width: 11px; height: 11px; border-radius: 4px; margin-right: 4px; vertical-align: -1px; border: 1px solid var(--border); }
.lg-answered { background: var(--primary-soft); border-color: var(--primary-line); }
.lg-blank { background: var(--card); }
.lg-flag { background: var(--warn-soft); border-color: var(--warn); }
.lg-cur { background: var(--card); outline: 2px solid var(--primary); }

.grid-toggle { display: none; }

/* ═══════════════════ 结果页 ═══════════════════ */
.result-hero { display: flex; align-items: center; gap: 30px; padding: 30px 34px; margin-bottom: 16px; flex-wrap: wrap; }
.score-ring {
  --pct: 0;
  flex: none; width: 128px; height: 128px; border-radius: 50%;
  background: conic-gradient(var(--grad-a) calc(var(--pct) * 1%), var(--border) 0);
  display: flex; align-items: center; justify-content: center; position: relative;
}
.score-ring::before { content: ""; position: absolute; inset: 10px; border-radius: 50%; background: var(--card); }
.score-ring .score-num { position: relative; font-size: 34px; font-weight: 800; color: var(--primary); z-index: 1; }
.score-ring .score-unit { position: relative; z-index: 1; font-size: 13px; color: var(--muted); margin-top: 26px; margin-left: -4px; }
.result-meta { flex: 1; min-width: 220px; }
.result-meta h2 { font-size: 22px; margin-bottom: 4px; }
.result-meta p { color: var(--muted); font-size: 13.5px; }
.result-counts { display: flex; gap: 12px; margin-top: 14px; flex-wrap: wrap; }
.rc { background: var(--soft-bg); border: 1px solid var(--border); border-radius: 10px; padding: 8px 18px; text-align: center; min-width: 76px; }
.rc b { display: block; font-size: 20px; }
.rc span { font-size: 12px; color: var(--muted); }
.rc-correct b { color: var(--success); }
.rc-wrong b { color: var(--danger); }
.rc-blank b { color: var(--warn); }
.result-actions { display: flex; flex-direction: column; gap: 10px; }

.result-grid { display: grid; grid-template-columns: 1fr 1.6fr; gap: 16px; margin-bottom: 16px; }

.stat-rows { display: flex; flex-direction: column; gap: 13px; }
.stat-row .stat-top { display: flex; justify-content: space-between; font-size: 13.5px; margin-bottom: 5px; }
.stat-row .stat-name { font-weight: 600; }
.stat-row .stat-val { color: var(--muted); font-variant-numeric: tabular-nums; }
.stat-row .stat-val.weak { color: var(--danger); font-weight: 700; }
.stat-row .stat-val.good { color: var(--success); font-weight: 700; }
.stat-bar { height: 7px; background: var(--track); border-radius: 999px; overflow: hidden; }
.stat-fill { height: 100%; border-radius: 999px; background: var(--success); }
.stat-fill.mid { background: var(--warn); }
.stat-fill.bad { background: var(--danger); }
.tag-weak { background: var(--danger-soft); color: var(--danger); font-size: 11px; font-weight: 700; border-radius: 6px; padding: 1px 7px; margin-left: 6px; }

/* AI 分析 */
.ai-card { margin-bottom: 16px; }
.ai-head { display: flex; justify-content: space-between; align-items: center; gap: 14px; flex-wrap: wrap; }
.ai-head .card-title { margin-bottom: 0; }
.ai-tip { font-size: 12.5px; color: var(--muted); margin: 10px 0 16px; }
.ai-loading { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 14px; padding: 18px 0; }
.spinner {
  width: 22px; height: 22px; border-radius: 50%; flex: none;
  border: 3px solid var(--border); border-top-color: var(--primary);
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.ai-error { background: var(--danger-soft); border: 1px solid #fecaca; color: #b91c1c; border-radius: 10px; padding: 12px 16px; font-size: 13.5px; margin-top: 12px; }
html[data-theme="dark"] .ai-error { color: #fca5a5; border-color: #7f1d1d; }

.ai-report { border-top: 1px dashed var(--border); margin-top: 16px; padding-top: 18px; font-size: 14.5px; }
.ai-report h1, .ai-report h2 { font-size: 17px; margin: 20px 0 10px; padding-left: 10px; border-left: 4px solid var(--primary); }
.ai-report h3 { font-size: 15px; margin: 16px 0 8px; color: var(--primary-600); }
.ai-report p { margin: 8px 0; }
.ai-report ul, .ai-report ol { margin: 8px 0 8px 22px; }
.ai-report li { margin: 4px 0; }
.ai-report strong { color: var(--text); }
.ai-report hr { border: none; border-top: 1px dashed var(--border); margin: 16px 0; }
.md-table-wrap { overflow-x: auto; margin: 12px 0; }
.md-table-wrap table { border-collapse: collapse; width: 100%; font-size: 13.5px; }
.md-table-wrap th, .md-table-wrap td { border: 1px solid var(--border); padding: 7px 12px; text-align: left; }
.md-table-wrap th { background: var(--soft-bg); font-weight: 700; white-space: nowrap; }
.md-table-wrap tr:nth-child(even) td { background: var(--primary-faint); }

/* 错题回顾 */
.wrong-head { display: flex; justify-content: space-between; align-items: center; gap: 14px; flex-wrap: wrap; margin-bottom: 16px; }
.wrong-head .card-title { margin-bottom: 0; }
.seg { display: flex; background: var(--softer-bg); border-radius: 10px; padding: 3px; }
.seg-btn { border: none; background: transparent; padding: 6px 14px; border-radius: 8px; font-size: 13px; font-weight: 600; color: var(--muted); cursor: pointer; font-family: inherit; }
.seg-btn.selected { background: var(--card); color: var(--primary); box-shadow: 0 1px 4px rgba(15, 23, 42, .1); }

.review-item { border: 1px solid var(--border); border-radius: 12px; padding: 18px 20px; margin-bottom: 12px; background: var(--card); }
.review-item.item-blank { background: var(--warn-soft); border-color: #fde68a; }
html[data-theme="dark"] .review-item.item-blank { border-color: #5a4410; }
.wi-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.wi-no { font-weight: 800; color: var(--muted); font-size: 13px; }
.wi-status { margin-left: auto; font-size: 12px; font-weight: 700; border-radius: 6px; padding: 2px 10px; }
.wi-status.wrong { background: var(--danger-soft); color: var(--danger); }
.wi-status.right { background: var(--success-soft); color: var(--success); }
.wi-q { font-size: 14.5px; margin-bottom: 12px; white-space: pre-wrap; word-break: break-word; }

/* 错题回顾：原题选项列表 */
.wi-options { display: flex; flex-direction: column; gap: 7px; margin-bottom: 12px; }
.wi-opt {
  display: flex; align-items: flex-start; gap: 10px;
  border: 1px solid var(--border); border-radius: 9px;
  padding: 8px 12px; font-size: 13.5px; background: var(--card);
}
.wi-opt .wo-letter {
  flex: none; width: 22px; height: 22px; border-radius: 7px; margin-top: 1px;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; background: var(--track); color: var(--muted);
}
.wi-opt .wo-text { flex: 1; min-width: 0; word-break: break-word; }
.wi-opt .wo-mark { flex: none; margin-left: auto; font-weight: 800; font-size: 14px; color: transparent; }
.wi-opt .wo-tag {
  flex: none; margin-left: 8px; font-size: 11px; font-weight: 700;
  border-radius: 6px; padding: 1px 8px; background: var(--success-soft); color: var(--success);
  align-self: center;
}
.wi-opt .wo-tag.wo-tag-picked { background: var(--danger-soft); color: var(--danger); }
.wi-opt.opt-right { border-color: var(--success); background: var(--success-soft); }
.wi-opt.opt-right .wo-letter { background: var(--success); color: #fff; }
.wi-opt.opt-right .wo-mark { color: var(--success); }
.wi-opt.opt-wrong { border-color: var(--danger); background: var(--danger-soft); }
.wi-opt.opt-wrong .wo-letter { background: var(--danger); color: #fff; }
.wi-opt.opt-wrong .wo-mark { color: var(--danger); }
.wi-ans { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 10px; }
.ans-chip { font-size: 13px; border-radius: 8px; padding: 6px 12px; font-weight: 600; }
.ans-chip.wrong { background: var(--danger-soft); color: var(--danger); }
.ans-chip.right { background: var(--success-soft); color: var(--success); }
.wi-expl { font-size: 13.5px; color: var(--text-soft); background: var(--soft-bg); border-radius: 10px; padding: 10px 14px; }
.wi-expl b { color: var(--text); }

/* ═══════════════════ 错题本 ═══════════════════ */
.wb-hero { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; margin-bottom: 16px; }
.wb-stats { display: flex; gap: 10px; flex-wrap: wrap; }
.wb-stat { background: var(--soft-bg); border: 1px solid var(--border); border-radius: 12px; padding: 12px 20px; text-align: center; min-width: 96px; }
.wb-stat b { display: block; font-size: 22px; color: var(--primary); font-variant-numeric: tabular-nums; }
.wb-stat span { font-size: 12px; color: var(--muted); }
.wb-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.wb-filters { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 16px; }
.wb-select {
  padding: 7px 10px; border-radius: 10px; border: 1px solid var(--border);
  font-size: 13px; background: var(--card); color: var(--text); font-family: inherit; cursor: pointer; width: auto;
}
.wb-search { width: 200px; padding: 7px 12px; }
.wb-empty { text-align: center; padding: 36px 10px; color: var(--muted); }
.wb-empty b { display: block; font-size: 18px; color: var(--text); margin-bottom: 6px; }
.wb-item { border: 1px solid var(--border); border-radius: 12px; padding: 16px 18px; margin-bottom: 12px; background: var(--card); }
.wb-item.wb-mastered { opacity: .62; }
.wb-badges { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 8px; }
.wb-meta { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; font-size: 12.5px; color: var(--muted); margin-top: 10px; padding-top: 10px; border-top: 1px dashed var(--border); }
.wb-meta .wb-key { font-weight: 700; color: var(--text-soft); }
.wb-meta .wb-wrong { color: var(--danger); font-weight: 700; }
.wb-actions-row { display: flex; align-items: center; gap: 8px; margin-left: auto; flex-wrap: wrap; }
.wb-btn { border: 1px solid var(--border); background: var(--card); font-size: 12px; font-weight: 600; color: var(--muted); border-radius: 8px; padding: 5px 12px; cursor: pointer; font-family: inherit; transition: all .13s ease; }
.wb-btn:hover { border-color: var(--primary-line); color: var(--primary); background: var(--primary-mist); }
.wb-btn.danger:hover { border-color: var(--danger); color: var(--danger); background: var(--danger-soft); }
.wb-btn.ok { border-color: var(--success); color: var(--success); background: var(--success-soft); }
.wb-toggle { color: var(--primary); background: var(--primary-soft); border-color: var(--primary-line); }
.wb-history { margin-top: 10px; padding: 10px 14px; background: var(--soft-bg); border-radius: 10px; font-size: 12.5px; color: var(--muted); }
.wb-history b { color: var(--text); font-size: 12.5px; }
.wb-h-row { display: flex; gap: 10px; padding: 3px 0; }
.wb-h-row .ok { color: var(--success); font-weight: 700; }
.wb-h-row .no { color: var(--danger); font-weight: 700; }
.similar-cats { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; max-height: 300px; overflow: auto; }
.similar-cat-chip {
  border: 1.5px solid var(--border); background: var(--primary-faint); color: var(--muted);
  border-radius: 999px; padding: 7px 14px; font-size: 13px; font-weight: 600;
  cursor: pointer; font-family: inherit; transition: all .13s ease; text-align: center;
}
.similar-cat-chip:hover { border-color: var(--primary-hover); color: var(--text); }
.similar-cat-chip.selected { border-color: var(--primary); background: var(--primary-soft); color: var(--primary); }
.modal-wide { max-width: 560px; }

/* ═══════════════════ 弹窗 / Toast ═══════════════════ */
.modal {
  position: fixed; inset: 0; background: rgba(15, 23, 42, .45);
  display: flex; align-items: center; justify-content: center; z-index: 200; padding: 20px;
  backdrop-filter: blur(2px);
}
.modal-box { max-width: 420px; width: 100%; padding: 26px; animation: fadein .2s ease; }
.modal-box h3 { font-size: 17px; margin-bottom: 10px; }
.modal-box p { font-size: 14px; color: var(--muted); }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 22px; }

.toast {
  position: fixed; left: 50%; bottom: 34px; transform: translateX(-50%);
  background: #1e293b; color: #fff; font-size: 14px; padding: 11px 22px;
  border-radius: 999px; z-index: 300; box-shadow: 0 10px 30px rgba(15, 23, 42, .3);
  animation: fadein .2s ease; max-width: 86vw; text-align: center;
}
html[data-theme="dark"] .toast { background: #e2e8f0; color: #1e293b; }

/* ═══════════════════ 响应式 ═══════════════════ */
@media (max-width: 920px) {
  .exam-layout { grid-template-columns: 1fr; }
  .grid-panel { display: none; }
  .grid-panel.mobile-open { display: block; position: fixed; inset: auto 12px 12px 12px; z-index: 150; max-height: 62vh; overflow: auto; }
  .grid-toggle { display: inline-flex; position: fixed; right: 16px; bottom: 20px; z-index: 140; box-shadow: var(--shadow); background: var(--primary); color: #fff; border-color: var(--primary); }
  .result-grid { grid-template-columns: 1fr; }
  .result-hero { flex-direction: column; text-align: center; }
  .result-counts { justify-content: center; }
  .result-actions { flex-direction: row; }
  .dir-grid { grid-template-columns: 1fr; }
  .field-row { grid-template-columns: 1fr; }
  .mode-grid { grid-template-columns: 1fr; }
  .wb-hero { flex-direction: column; align-items: stretch; }
  .wb-actions { justify-content: center; }
  .wb-search { width: 100%; }
  .wb-actions-row { margin-left: 0; width: 100%; }
  .exam-topbar { position: static; }
  .question-panel { padding: 20px 16px; }
  .q-nav { flex-wrap: wrap; }
  .top-header { flex-wrap: wrap; }
  .header-right { width: 100%; justify-content: space-between; }
}